Sources:
https://answersingenesis.org/astronomy/earth/book-enoch-and-flat-earth/
And…
The Book of Enoch
I think before reading this you should just read the article and scroll through it really quick. Read the headlines, the verses, what the site has to say about them, etc.
“The Book of Enoch is an important source for those who promote the notion that the earth is flat. A few portions of this rather long book teach that the earth is flat, but other passages are ambiguous about the earth’s shape. Flat earthers are selective about which portions of the Book of Enoch that they cite, because other passages clearly contradict aspects of the flat-earth model promoted today. The book of Enoch almost certainly is pseudepigraphal because there is considerable doubt that the patriarch Enoch wrote it, despite the claim within the book that he did. The Book of Enoch is not canonical. Therefore, it ought not be used to interpret Scripture, particularly in claiming the Bible teaches that the earth is flat.”
Enoch 18:1–5 reads,
And I saw the storehouses of all the winds, and I saw how with them He has adorned all creation, and I saw the foundations of the Earth.
And I saw the cornerstone of the Earth. And I saw the four winds which support the Earth and the sky.
And I saw how the winds stretch out the height of Heaven, and how they position themselves between Heaven and Earth; they are the Pillars of Heaven.
And I saw the winds which turn the sky and cause the disc of the Sun and all the stars to set.
And I saw the winds on the Earth which support the clouds and I saw the paths of the Angels. I saw at the end of the Earth; the firmament of Heaven above.
Enoch 18:6–12 reads,
And I went towards the south, and it was burning day and night, where there were seven mountains of precious stones, three towards the east and three towards the south.
And those towards the east were of coloured stone, and one was of pearl, and one of healing stone; and those towards the south, of red stone.
And the middle one reached to Heaven, like the throne of the Lord, of stibium, and the top of the throne was of sapphire.
And I saw a burning fire, and what was in all the mountains.
And I saw a place there, beyond the great earth; there the waters gathered together.
And I saw a deep chasm of the earth, with pillars of heavenly fire, and I saw among them fiery pillars of Heaven, which were falling, and as regards both height and depth, they were immeasurable.
And beyond this chasm, I saw a place, and it had neither the sky above it, nor the foundation of earth below it; there was no water on it, and no birds, but it was a desert place.
The last verse is interesting. Similarly, Enoch 21:1–2 reads:
And I went round to a place where nothing was made.
And I saw a terrible thing, neither the High Heaven nor the firm ground, but a desert place, prepared and terrible.
But get this, not only does the Book of Enoch say the Earth is Flat (you should check out the link), it also CONTRACTS itself and has some verses Flat-Earthers DON’T want to talk about. As I’ve said, check out the link and read the headline “Parts of the Book of Enoch Flat-Earthers don’t want to talk about”
So in conclusion, the book of Enoch claims the Earth is flat and is used by Flat-Earthers to defend their Flat Earth claims. This alone make the Book not cannon and unreliable. But it also contradicts itself just further making it unreliable. If a book goes against facts we know to be true, unreliable. If a book like the book of Enoch contradicts itself, it’s just as unreliable. You should check the link out. I’ll look the link you have sent in.